Ch 10 Guided Notes (Cell Division
Name: ________________________________ Date:_______________
BIG ESSENTIAL QUESTIONS:
1. Why do cells divide?
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2. How does a cell control when it divides?
3. What happens when cells divide uncontrolled?
Cell Cycle
Stage 1: Interphase
• Interphase – cell grows to maturity, carries out cellular functions, and replicates DNA.
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Chromosome Structure
• Sister Chromatids – structure that contains identical DNA copies; formed during DNA replication
(Interphase  S); 1/2 of a chromosome.
• Centromere – center of the chromosome where sister chromatids attach.
• # of chromosomes:
• # of pairs of chromosomes:
• Sex Chromosomes for Females:
Sex Chromosomes for Males:
Stage 2: Mitosis
• Process that increases the number of cells.
• Adds new cells as you age
• Replaces older, damaged cells
• 4 Substages of Mitosis  PMAT
1. Early Prophase:
1a. Late Prophase:
2. Metaphase:
3. Anaphase:
4. Telophase:
Stage 3: Cytokinesis
• Divide cytoplasm  two identical daughter cells.
• Animal Cells  microfilaments pinch the cytoplasm in half forming (“cleavage furrow”)
• Plant Cells  cell plate forms between the two nuclei  cell wall forms
Cell Cycle Control
 What is the cell cycle controlled by?
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What could possibly happen if the cell does not meet checkpoint requirements?
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G1 Checkpoint:
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G2 Checkpoint:
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Mitosis Checkpoint:
Vocabulary Terms:
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Cell Division
Mitosis
Asexual reproduction
Sexual reproduction
Chromosomes
Chromatin
Centrioles
Tumor
cancer